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. 2020 Sep 30;2(1):47–76. doi: 10.1039/d0cb00151a

Synthetic lethal interactions between G4 stabilising drugs and pharmacological DDR inhibition.

Ligand Synergistic DDR drug/treatment DDR mechanism implicated Marker Cell type/model Ref.
TMS Imatinib, daunotubicin, mitoxantrone, vincristine Telomere damage CHK2, ATM, p21, p27 K562, OM9;22 leukaemia cells 271
TMS NSC19630 (WRN helicase inhibitor) Stalled replication, DNA damage, cell death γH2AX, PCNA U2OS 318
RHSP4 Taxol Telomere damage, chromosome fusions γH2AX/TRF1 UXF1138L cells and xenograft 319
RHPS4 Camptothecin (TOP1 inhibitor) then RHPS4 (CI < 0.2), bleomycin (CI ≈ 0.7) Apoptosis, tumour growth inhibition γH2AX M14 melanoma cells, HT29 colon-derived xenograft 320
RHPS4 GPI 15427 (PARP inhibitor) followed by RHPS4, camptothecin Telomere damage chromosome aberrations (or PARP1KD sensitisation) PARP/telomere colocalisation BJ fibroblasts, HT29-derived xenografts 321
RHPS4 SN-38 or ST1484 (TOP1 inhibitors) followed by RHPS4 (CI ≈ 0.1) Telomere damage, cell death γH2AX, TOP1 accumulation at telomeres BJ fibroblasts, HT29 322
No synergy with adriamycin and doxorubicin (TOP2a inhibitors)
RHSP4 derivates SN-38 (CI < 0.5) Telomere damage, stalled replication γH2AX/TRF1, PCNA HT29 323
RHPS4 Ionising radiation (IR) Telomere damage, G2-phase block, chromosomal rearrangements, tumour growth inhibition γH2AX and 53BP1/TRF1 colocalisation U251MG glioblastoma cells and xenograft 324 and 325
PDS NU7441 (DNA-PK inhibitor) Induction of DNA:RNA hybrid structures (R-loops), DNA damage, DSBs and DDR signalling γH2AX, 53BP1, ATM, antibody colocalisation: BG4 (G4) and S9.6 (R-loop) DNA-PK−/− MO59J vs. DNA-PK+/+ MO59K glioblastoma cells 309
PDS, FG NU7441 (DNA-PK inhibitor) DSBs, ATM-dependent DDR γH2AX, ATM SV40-transformed MRC-5 fibroblasts 92
PDS, PDSI NU7441 (DNA-PK inhibitor) DSBs, DDR, apoptosis 53BP1, RAD51 (or BRCA2−/−) HCT116 colon cancer cells 315
PDS MK1775 (WEE1 cell cycle kinase inhibitor) and pimozide (FA repair USP1 inhibitor) G4 stabilisation, cell death Sensitised to KD of BRCA1&2, POLQ, USP1, TOP1, WEE1 etc. A375 melanoma cells, HT1080 fibrosarcoma cells 290
PhenDC G4 stabilisation, cell death Sensitised to KD of BRCA1 and TOP1
PDS, PhenDC ME0328 (PARP3 inhibitor), KU0058948 (PARP1 inhibitor) Chromosome rearrangements, DSBs, G2-phase block γH2AX, 53BP1, G4-binding 1H6 antibody staining, PARP3KO sensitised A549 lung adenocarcinoma cells 114
CX-5461, CX-3543. PDS IR, hydroxyurea DNA damage γH2AX, 53BP1, CHK1/2, RAD51, ATRXKD sensitised Murine normal human astrocytes, glioma stem cells 326
CX-5461 BMN-673 (PARP inhibitor) Pol1 transcription inhibition, replication stress, DNA damage, G2-phase block, no G4-stabilisation effect ATM/ATR, RPA, γH2AX, HR-deficient, BRCA1−/− and MYC−/− cells sensitised Ovarian cancer cells and xenografts 303
EMICORON SN-38 then EMICORON; EMICORON then oxaliplatin or 5-FU (all CI < 0.5) Telomeric DNA damage HT29 colon cancer cells and xenografts 327